Miha mihar

array.reduce(true) { |x, y| x and y }

Useful for checking in Rails if a collection of models all have a flag set to true.

E.g.:

signers.map(&:ready?).reduce(true) { |x, y| x and y }

More examples:

Keybase proof

I hereby claim:

I am mihar on github.
I am mihar (https://keybase.io/mihar) on keybase.
I have a public key whose fingerprint is 8C74 E3A9 2C2D BF69 11F9 2DA1 BA08 69AE 85A1 6F9E

To claim this, I am signing this object:

Orderbook price calculation

Write a function btc2usd that calculates how much dollars you need to buy X bitcoin at this moment.

A sample asks part of the orderbook looks like this:

asks = [['1.00000000', '100.00', 1], ['2.00000000', '200.00', 2], ['4.00000000', '400.00', 4], ['8.00000000', '800.00', 8], ['16.00000000', '1600.00', 16]]
//        |              |       |    
// amount of btc price per BTC no. of equal orders

	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>App Redirection</title>
	</head>
	<body>

	<!-- iframe used for attempting to load a custom protocol -->
	<iframe style="display:none" height="0" width="0" id="loader"></iframe>

	module SimpleStateMachine
	# Usage:
	#
	# First, extend your model of choise with this module
	#
	# extend SimpleStateMachine
	#
	# Then you can call the method states() and pass all the states
	# that your model supports. E.g.:
	#

	(function(){
	var externalStylesheets = [];
	var fonts = {};

	function findExternalStylesheets(obj, callback) {
	sheet = document.styleSheets,
	i = sheet.length,
	rule = null;
	while( 0 <= --i ) {
	if (sheet[i].cssRules === null) {